;(() => {
  class Person {
    constructor(public name: string, public age: number) {}
  }
  class Teacher extends Person {
    constructor(public age: number) {
      super('嘿嘿', 19)
    }
  }
  const person = new Person('胭脂', 99)
  console.log(person)
  const teacher = new Teacher(18)
  console.log(teacher)
})()
